UL
®
LSI/CSI
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747
LSI
RDD 104
(631) 271-0400 FAX (631) 271-0405
January 2000
A3800
SELECTABLE 4 DECADE CMOS DIVIDER
FEATURES:
•
Selectable Divide by 10 or 100 or 1,000 or 10,000
• Clock Input Shaping Network Accepts Fast or Slow
Edge Inputs
• Active Oscillator Network for External Crystal
• Square Wave Output
• Output TTL Compatible at +4.5 Volt Operation
• High Noise Immunity
• Reset
• All Inputs Protected
• +4.5V to +15V Operation (V
DD
-V
SS
)
• Low Power Dissipaton
• RDD104 (DIP); RDD104-S (SOIC) - See Figure 1
PIN ASSIGNMENT
- TOP VIEW
DIVIDER
SELECT-1
DIVIDER
SELECT-2
1
8
V
DD
(+V)
2
RDD 104
7
OUTPUT
V
SS
(-V)
3
6
CLOCK OUTPUT
RESET
4
5 CLOCK INPUT
DESCRIPTION OF OPERATION:
The RDD104 is a monolithic CMOS four decade
divider circuit that advances on each negative
transition of the input clock pulse. When the reset
input is high the circuit is cleared to zero. The
clock input is applied to a three stage inverting
amplifier network whose output is brought out so
that an external crystal network can be used to
form an oscillator circuit. If the clock output is not
used,the amplifier acts as an input buffer. Two
select inputs are provided which enables the circuit
to divide by 10, 100, 1,000 or 10,000.
FIGURE 1
MAXIMUM RATINGS:
PARAMETER
SYMBOL
VALUE
UNIT
Storage Temperature
Operating Temperature
DC Supply Voltage
Voltage at any input
T
STG
-65 to +150
T
A
-40 to +85
(V
DD
- V
SS
)
+18
V
IN
V
SS
- 0.5 to V
DD
+ 0.5
°C
°C
V
V
DC ELECTRICAL CHARACTERISTICS:
(All voltages referenced to Vss)
V
DD
-40°C +25°C
Quiescent Device Current
4.5V
10V
4.5V
10V
4.5V
10V
4.5V
10V
10
20
0.01
0.01
4.49
9.99
1.3
3.0
10
20
0.01
0.01
4.49
9.99
1.3
3.0
+85°C
300
600
0.05
0.05
4.45
9.95
1.3
3.0
UNIT
uA Max
uA Max
V Min
V Min
V Max
V Max
V Min
V Min
The Output Division is selected according to the
following truth table:
DIVIDER SELECT INPUTS:
SELECT 2
SELECT 1
0
0
0
1
1
0
1
1
OUTPUT
DIVISION
10,000
1,000
100
10
Output Voltage, Low Level
High Level
Input Noise Immunity
(Low and High)
Output Drive Current:
N-Channel Sink Current
(V
OUT
= Vss + 0.4V)
P-Channel Source Current
(V
OUT
= V
DD
- 1V)
Input Capacitance (any input)
4.5V
10V
4.5V
10V
2.3
5.0
1.1
2.5
1.9
4.0
0.95
2.1
5.0
1.6
3.5
0.8
1.8
mA Min
mA Min
mA Min
mA Min
pF Max
The information included herein is believed to be
accurate and reliable. However, LSI Computer Systems,
Inc. assumes no responsibilities for inaccuracies, nor for
any infringements of patent rights of others which may
result from its use.
RDD104-092491
LSI [ LSI COMPUTER SYSTEMS ]
